1 /*

     2  * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 package sun.hotspot;

    26 

    27 import java.lang.reflect.Method;

    28 import java.security.BasicPermission;

    29 import sun.hotspot.parser.DiagnosticCommand;

    30 

    31 public class WhiteBox {

    32 

    33   @SuppressWarnings("serial")

    34   public static class WhiteBoxPermission extends BasicPermission {

    35     public WhiteBoxPermission(String s) {

    36       super(s);

    37     }

    38   }

    39 

    40   private WhiteBox() {}

    41   private static final WhiteBox instance = new WhiteBox();

    42   private static native void registerNatives();

    43 

    44   /**

    45    * Returns the singleton WhiteBox instance.

    46    *

    47    * The returned WhiteBox object should be carefully guarded

    48    * by the caller, since it can be used to read and write data

    49    * at arbitrary memory addresses. It must never be passed to

    50    * untrusted code.

    51    */

    52   public synchronized static WhiteBox getWhiteBox() {

    53     SecurityManager sm = System.getSecurityManager();

    54     if (sm != null) {

    55       sm.checkPermission(new WhiteBoxPermission("getInstance"));

    56     }

    57     return instance;

    58   }

    59 

    60   static {

    61     registerNatives();

    62   }

    63 

    64   // Memory

    65   public native long getObjectAddress(Object o);

    66   public native int  getHeapOopSize();

    67 

    68   // Runtime

    69   // Make sure class name is in the correct format

    70   public boolean isClassAlive(String name) {

    71     return isClassAlive0(name.replace('.', '/'));

    72   }

    73   private native boolean isClassAlive0(String name);

    74 

    75   // G1

    76   public native boolean g1InConcurrentMark();

    77   public native boolean g1IsHumongous(Object o);

    78   public native long    g1NumFreeRegions();

    79   public native int     g1RegionSize();

    80   public native Object[]    parseCommandLine(String commandline, DiagnosticCommand[] args);

    81 

    82   // NMT

    83   public native boolean NMTAllocTest();

    84   public native boolean NMTFreeTestMemory();

    85   public native boolean NMTWaitForDataMerge();

    86 

    87   // Compiler

    88   public native void    deoptimizeAll();

    89   public native boolean isMethodCompiled(Method method);

    90   public native boolean isMethodCompilable(Method method);

    91   public native boolean isMethodQueuedForCompilation(Method method);

    92   public native int     deoptimizeMethod(Method method);

    93   public native void    makeMethodNotCompilable(Method method);

    94   public native int     getMethodCompilationLevel(Method method);

    95   public native boolean setDontInlineMethod(Method method, boolean value);

    96   public native int     getCompileQueuesSize();

    97 }